I was organising some files and noticed a progress bar appeared in the top left which was slowly moving from left to right. A message appeared to say something like '2 operations in progress'. When it completed all of my photos had disappeared from lightroom.

Lightroom backs itself up every week and I have complete disc back ups on external drives. When I re-import photos that I had previously worked on they are now un-edited. What is the best way to restore my edits to the 10,000 photos that disappeared?